Insulating electric conductor.



No. 768,755. PATENTED AUG. 30, 1904].

, I. KITSEE. INSULATING ELECTRIC CONDUCTOR.

APPLICATION FILED JUNE 19, 1902. no MODEL.

z ulcanz zz ng Chamer @fittnea no 5% UNITED STATES Patented August 30, 1904.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

INSULATING ELECTRIC CONDUCTOR.

SPECIFICATION forming part of Letters Patent No. 768,755, dated August 30, 1904.. Application filed June 19, 1902. Serial No. 112,355. (No model.)

To all whom, it may concern:

Be it known that I, ISIDOR KrrsEE, of the city and county of Philadelphia, State of Pen nsylvania, have invented certain new and useful Improvements in Insulating Electric Conductors, (Case No. 127,) of which the following is a specification.

My invention relates to an improvement in curing or vulcanizing the insulation with which an electric conductor is being provided.

In cases where the conductor is covered with an insulating material necessitating vulcanization-such, for instance, as rubber, gutta-percha, &c.the conductor after having been provided with said insulating material is placed in what is called the vulcanizing-chamber and subjected therein to heat. Through the action of this heat the sulfur contained in the insulating material undergoes a chemical change and partially combines with the insulating material. This action is called vulcanizing or curing.

It is well known to persons versed in the art that vulcanizing is best carried on with the aid of pressure; but as such pressure cannot well be applied to the wire wound on a reelor otherwise coiled then this vulcanizing has to be done only with the aid of heat. In such cases it would be of great advantage could the heat be applied from both sides of the covering. In the processes as carried on to-day this is impossible, and the aim of my invention is to overcome the difficulty experienced to-day and to produce such curing or vulcanizing from within alone or, if preferred, from within and without.

It must be borne in mind that if a sheet of rubber is vulcanized only from one side the product is never as compact and solid as if vulcanization takes place from both sides, and as to-day the rubber covering of a wire is only vulcanized from without it is easily understood that this is one of the main reasons why this covering is not as compact as vulcanized rubber per se usually subjected to heat and pressure from both sides. The great advantage, therefore, of this my invention, as will be hereinafter described, substantially illustrated in the drawings, and more clearly current E.

pointed out in the claims following the specification, is easily seen.

Referring to the drawings, both Figures 1 and 2 are diagrammatic views embodyingmy invention.

In Fig. 1, A is the reelon which the wire B is coiled. G represents guide-rollers for said wire. C represents rollers on which the insulating material C is placed, preferably in the shape of two narrow strips, into which strips the wire is embedded and which strips are compressed in one mechanical unit by the action of the compressing-rollers H. D is a reel or drum on which the wire is wound after being insulated. E is a source of electric current connected with one pole through wire 3 to one terminal of the wire to be in sulated and connected through wire 2, variable resistance F, and Wire 1 to the other terminal of the wire to be insulated.

In Fig. 2, B is the wire proper, C the in sulating-covering for such wire, which covering has to be vulcanized or cured.

In both the figures is shown in dotted lines the vulcanizing-chamber, which may or may not be used, according to the desire in various cases.

The modus operrmclvl of my invention in accordance with Fig. l is as follows: One terminal o1 the wire is carried from the reel A to the reel D and fastened thereto. Both terminals-the one remaining at A and the one carried to Dare connected to the source of This source of current should be strong enough to raise the temperature of the wireB to the required degree. The insulating-strips C C are then placed in position around the wire B, so that these strips are carried through the rollers H and are thereby compressed on the Wire, and as at the same time that these compressing-rollers exert a pressure on the covering the current raises the wire to the necessary degree of temperature the covering is slowly vulcanized, and if the continuation of this process is carried on in a drying-chamber this vulcanization can also take place from without.

In the drawings I have only illustrated two pairs of compressing-rollers; but it is obvious that any number may be used, and in practice it is preferred that a great number of such rollers shall be employed, so that the wire, with its covering, shall for a comparatively long time pass between said rollers, thereby giving pressure as well as heat to the vulcanizing process.

I have illustrated in the drawings the source of current as to consist of electric batteries; but any other source may be substituted therefor, and 1 have illustrated the rheostat as to consist of stationary contact-points and a movable lever; but any other arrangement capable. of regulating the flow of the current may be substituted therefor.

l have not illustrated in the drawings the means by which the reels A, C, and D are revolved, as such means are well known in the covering of wires.

The moclus opermidi of my invention in accordance with Fig. 2 is simply that the bare terminals of the wire B are connected to a source of current adjustable through the rheostat F at the same time that said wire is placed in the vuleanizing-chamber.

the ends of these strips as to produce economically a homogeneous covering. The employment of two strips was only discontinued because the inner surface of these strips could not well be heated in the method of covering wires as practiced to-day. With my invention as herein described, wherein the wire is raised to the necessary temperature that is, to the temperature required for vulcanizing,

and therefore sutiicient for uniting the two surfaces-this difiieulty entirely ceases, and as at the same time through the compressingrollers the necessary pressure can be applied to the heated strips it is obvious that, as oth erwise the employment of the two strips is desirable and more economical than the folding-ovcr process as practiced to-day, the covering of wire with two strips can readily be accomplished and the insulating process thereby be carried on more economically and with the aid of less complicated machinery than is employed to-day.

Having now described my invention, what 1 claim as new, and desire to secure by Letters Patent, is-

' 1. In the process of insulating electric conductors with a material necessitating vulcanization, the step which consists in producing such vulcanization by the'raising of the temperature of the conductor to the degree necessary for such vulcanization through the passage of an electric current through the conductor.

2. The method of insulating an electric conductor, which consists in raising the temperature of the conductor by passing therethrough an electric current, and simultaneously therewith applying the insulation by pressure to said conductor.

8. The method of insulating an electric cond uctor, which consists in raising the temperature of the conductor by passing therethrough an electric current, applying strips of insulating material to said conductor while the ten'iperature thereof is raised, and uniting said strips with said conductor by pressure.

4. The process which consists in causing sulfur to combine with the insulating material with which a wire is provided by raising the temperature of the wire by the passage of electric currents therethrough, whereby a chemical action is produced between said sulfur and said insulating material and said covering is made to strongly adhere to said wire.

5. The process which consists in raising the temperature of a metallic wire embedded in an insulating compound containing sulfur, independently of the temperature of the surrounding atmosphere, to a degree to cause said sulfur to undergo a chemical combination with said compound.

In testimony whereof I hereby sign my name this 7th day of June, A. D. 1902.

ISIDOR KITSEE.

\Vitnesses:

EDITH R. S'rILLEY, UHAs. KREssnN'sUoIi. 

